THE DERIVING ON THE PREDICTIVE EQUATION OF EPIDEMIC OF POPLAR LEAF RUST DISEASE CAUSED BY MELAMPSORA MAGNUSIANA IN NURSERYS OF HUABEI REGION
Zheng Dapeng, Wagn Xin, Su Yongzhi, Li Zhehua, Liang Shuanglin
Acta Phytopathologica Sinica . 1989, (2): 109 -113 . 

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